Method using abrasion resistant coating for stacks of fiber cement siding
Patent 7442416 Issued on October 28, 2008. Estimated Expiration Date: 
March 15, 2027. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 15, 2027. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3412054 Thermoplastic resin paste impregnated substrates Boards and panels Aqueous polyurethane - polyolefin compositions Polyurethane coating compositions Production of polyurethane polymers, the polymers so produced, and compositions containing them Abrasion resistant silicone coating composition Binder composition and its use for the production of a coating or sealing composition Plastic siding panels with outdoor weatherable embossed surfaces Aqueous polyurethane compositions InventorsAssigneeApplicationNo. 11724513 filed on 03/15/2007US Classes:427/393.6, Asbestos, ceramic, concrete, or masonry base427/385.5Resin, resin precursor, rubber, or hardenable oil-containing coating , 427/385.3ExaminersPrimary: Tran, ThaiAttorney, Agent or FirmForeign Patent References
International ClassB05D 3/00ClaimsWhat is claimed is:1. A method of making a fiberboard cement siding product prior to attaching the product to a building, the method comprising: providing a fiberboard cement substrate; coating a first major surface of the fiberboard cement substrate with a decorative coating; coating the exposed surface of the decorative coating with a topcoat layer comprising a polyurethane dispersion; and curing the topcoat layer to provide a marand abrasion resistant coated fiberboard cement siding product; wherein curing comprises a thermal curing process that does not expose the siding to a board surface temperature in excess of 100° C.; wherein the fiberboard cement substrate has adensity of at least 1 g/cm3 and comprises wood pulp, silica and cement, and the outer topcoat layer has a dry thickness of at least 8 microns. 2. The method of claim 1, wherein the topcoat layer has a dry thickness of at least 10 microns. 3. The method of claim 1, wherein the topcoat layer is cured at a board surface temperature of less than 80° C. 4. The method of claim 1, wherein the finished siding piece exhibits at most a slight change in appearance after 20 double rubs with medium coarse #2 steel wool pad. 5. The method of claim 1, wherein prior to coating a first major surface of the fiberboard cement substrate with a decorative coating, the first major surface is coated with a sealer and/or a primer. 6. The method of claim 1, wherein the topcoat layer further comprises an abrasion resistance promoting adjuvant. 7. The method of claim 1, further comprising stacking a first coated fiberboard cement siding product against a second coated fiberboard cement siding product. 8. A method of making a stack of fiberboard cement siding products, comprising: preparing two or more coated fiberboard cement siding products, the method comprising: providing a fiberboard cement substrate; optionally coating a first majorsurface of the fiberboard cement substrate with one or more layers comprising a sealer, a primer, or both; coating one or more layers of a decorative coating to the outermost surface of die optionally coated fiberboard cement substrate; coating theexposed surface of the one or more layers of a decorative coating with a topcoat layer comprising a polyurethane dispersion; curing the topcoat layer to provide a mar and abrasion resistant coated fiberboard cement siding product; wherein the curingstep comprises a thermal curing process that does not expose the siding to a board surface temperature in excess of 100° C.; and stacking the two or more coated fiberboard cement siding products to form a stack; wherein the fiberboard cementsubstrate has a density of at least 1 g/cm3 and comprises wood pulp, silica and cement, and the outer topcoat layer has a dry thickness of between 8 and 100 microns. 9. The method of claim 8, wherein stacking further comprises placing a liner between the coated siding products. 10. The method of claim 9, wherein the liner comprises a foam sheet. 11. The method of claim 8, wherein the coated siding product exhibits at most a slight change in appearance after 20 double rubs with medium coarse #2 steel wool pad. 12. The method of claim 8, wherein the polyurethane dispersion is an aliphatic isocyanate-based polyurethane dispersion. 13. The method of claim 8, wherein the polyurethane dispersion comprises a polyurethane having a number average molecular weight of at least 1800. 14. The method of claim 8, wherein the polyurethane dispersion comprises a polyurethane having an acid number between 6.5 and 80 mg KOH per grain solid polymer. 15. The method of claim 8, wherein the topcoat layer has a pigment volume concentration of less than 20 percent. 16. The method of claim 8, wherein the topcoat layer has a dry thickness of at least 10 microns. 17. The method of claim 8, wherein the thermal curing process provides a board surface temperature of less than 80° C. Other References
Field of SearchAsbestos, ceramic, concrete, or masonry baseResin, resin precursor, rubber, or hardenable oil-containing coating Heating or drying (e.g., polymerizing, vulcanizing, curing, etc.) Organic coating Of polyamidoester (polyurethane, polyisocyanate, polycarbamate, etc.) Of silicon containing (not as silicon alloy) |
